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Float level DMM

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Ozzsp250
Posts: 169
Joined: Tue Feb 16, 2016 12:35 am
Location: Arizona, USA

Float level DMM

Post by Ozzsp250 » Thu Feb 28, 2019 2:05 am

Would anyone know what the float level should be for the Daimler majestic major AUC 949 SU carburetor setting specification is?

Thanks,

Dennis

JDB
Posts: 95
Joined: Sun Mar 13, 2016 11:35 am

Re: Float level DMM

Post by JDB » Thu Feb 28, 2019 9:13 am

I've never seen one specified. Provided you've got the right float and it's sound (ie not half full of fuel; give it a shake and check it's empty, mine wasn't!) and the float lever and needle valve are all ok, it's self setting. All said parts are common to a number of carbs/vehicles and are readily available here: http://sucarb.co.uk/cf/vehicle/list/?ma ... e=Majestic
There are a miriad of float suppliers on ebay.
Hope this helps, JB

Christopher Storey
Posts: 239
Joined: Wed Mar 16, 2016 6:40 pm
Location: Cheshire

Re: Float level DMM

Post by Christopher Storey » Thu Feb 28, 2019 10:11 am

The usual setting for HD8 carburetters is that a 7/16 inch bar should just fit between the inner curve of fork of the needle valve lever, and the lid of the float chamber , with the valve just closed without compressing the spring loading of the needle ( assuming that your needles are the spring loaded type ). It's rather fiddly to adjust, as you need to bend the fork where it joins the shank at its inner point to achieve the setting

Ozzsp250
Posts: 169
Joined: Tue Feb 16, 2016 12:35 am
Location: Arizona, USA

Re: Float level DMM

Post by Ozzsp250 » Fri Mar 01, 2019 1:42 am

Thanks for that, I sent an email to Burlen and asked for the setting and as you stated its 7/16", standard setting and appropriate for my use.. I have the 2" carbs from a DMM on my ex-race 2.5 liter engine, the difference to where it was set to the 7/16" is night and day. I can now get the range of rpm out of the engine I had expected. Next step I need to confirm with the camshaft I have what the valve clearance should be.

JDB
Posts: 95
Joined: Sun Mar 13, 2016 11:35 am

Re: Float level DMM

Post by JDB » Fri Mar 01, 2019 9:00 am

Funnily enough, the day I replied to this was the day after I'd received and fitted my new needle valves from Burlen. Having failed to find the clearance figures, I'd just set them so they'd get maximum opening without any danger of them jamming on their return. Following Christopher's post I have re-checked the workshop manual - I'd initially scanned it for the sort of diagram you get in a Haynes manual - and indeed there it is, written down, only it says 9/16"...
JB

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